Organic Syntheses via Transition-Metal Complexes. 110.<sup>1</sup> A Convenient Regio- and Stereoselective Approach to the Angular Allylation of Bicyclic Cyclopentadienes Generated by the (1-Alkynyl)carbene Complex Route
]carbene tungsten compound 1a with secondary allylamines RNHCH2CHCH2 (R = CH2CHCH2, CH2CH2CH3, PhCH2) (2a−c) and pyridine affords (C6a-allyltetrahydropentalen-1-ylidene)amines 3a−c in 72−77% yields. Compounds 3 result from a highly regio- and stereoselective N,C-allyl rearrangement of 1-(allylamino)cyclopentadiene precursors 7, which are generated in a kinetically controlled process from compound 1a